Also, I am a little unclear on if I should be looking for high or low side current sensing for a project like mine?
That is entirely up to you since it is dependent upon where you insert the current sensing device.
Taking a step back and thinking about the intent and not actual question...
I don’t see how sensing the supply current of an RFID tag is a good indicator of an error condition since that current is unlikely to be a static level. Have you actually measured the current over the full range of operating conditions?
IMO I think you’re approaching the point of significantly diminishing returns for trying to add smarts to something that doesn’t need it. Sensing led current to know if they’re working? Power supplies are more likely to fail than led’s. Result is the same, no light.
Thanks, the part I was unclear about is the effect or limitations (if any) of high side or low side current sensing for this sort of application.
Using a multimeter I've measured the current draw on the RFID tag as it is powered with a 12V supply... I am still learning how these work so I'm not entirely sure during what conditions this would change?
My AC to DC supply has a fault light and output for a power fail condition as it also has a battery back up. So if the incoming power fails or something happens to the supply, it fails to the battery power supply and an indicator is triggered at the control panel.
The reason I wanted to see if the LEDs would fail to turn on (however unlikely) is because at the control panel if someone pushes the buttons to turn the LEDS on and they cannot see the LED lights from the control panel, they have no indication that the LEDs are not working. It sounds like several layers of redundancy but the lights are to warn others that someone is working in the area. I'm just putting together a rough proof of concept to show the idea. When it comes to safety, everyone loves several layers of protection.